Sony has noted that play and chat on PS3 are incompatible.
Here are the explanations: Shuhei Yoshida, president of Sony Worldwide Studios, tells us that all available memory is swallowed up by the games during operation. To Thatcher in power games on PS3, the same game itself must allocate memory to system memory on its own chat at the risk of falling performance. One can understand that developers prefer to use the memory for other applications more interesting. One more thing promised for months that Sony will not see the day directly integrated into the dash console problem that has no PS Vita since it has 512MB RAM and 128MB of RAM V-cons 256MB of RAM and 256MB of video RAM for the PS3.

http://ps3.gx-mod.com/modules/news/a...p?storyid=2899